A slow leak is likely caused by a nail, take it to Discount Tire / America's Tire, they will repair flats for free. They will inspect your tire, if they find a repairable leak, like a nail in the main section of the tread, they will remove your tire, patch it from the inside, rebalance and install, all for free of charge.
I also recommend paying for their lifetime Rotate & Balance with Road Hazard warranty package. It can be added to any vehicle, regardless if you bought your tires there or not. For my RAM, I paid $140 for it. But considering rotations at the dealership is $55 each time, and they don't even balance your tires, it's pays for itself after just 3 rotations. What's better is that it includes free tire replacement if they can't patch it safety. And considering that just one of my Rebel's tires cost $275 before tax, it's honestly a no brainer to get it.